Tunnel boring machine rolls off production line in Chengdu, China's Sichuan

This photo taken on Sept. 24, 2026 shows China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows an offline ceremony for China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows a partial view of China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows an offline ceremony for China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows a partial view of China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)

This photo taken on Sept. 24, 2026 shows a partial view of the cutterhead of China's homegrown tunnel boring machine (TBM) with ultra-large-diameter in Chengdu, southwest China's Sichuan Province. The tunnel boring machine (TBM) rolls off the production line in Xinjin District of Chengdu on Thursday.

Measuring 220 meters in length with a cutterhead diameter of 13.01 meters, it weighs about 3,500 tonnes. The TBM will be put into use in the tunnel construction of Jinkouhe-Xichang expressway in Sichuan Province. (Xinhua/Wang Xi)